#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

extern FILE *stdin;
extern FILE *stdout;
extern FILE *stderr;

int main()
{
	printf("stdin:%d\n",stdin->_fileno);
	printf("stdout:%d\n",stdout->_fileno);
	printf("stderr:%d\n",stderr->_fileno);//有呢,提示耗着呢
	
	

	return 0;
}




